In 1927, charles lindbergh was the first person to fly nonstop across the atlantic ocean. today, commercial airliners fly from new york to paris five times as fast, or 400 miles/hour faster than lindbergh's plane.
a. at what speed did charles lindbergh''s plane fly?
b. at what speed do commercial airplanes fly today?

plz show work on both

a. 100 mph

b. 500 mph

Step-by-step explanation:

a.

Let the speed of Lindbergh's plane be x.

Today's planes are 5 times faster, so their speed is 5x.

Today's planes speed is 400 mph faster than Lindbergh's speed.

x + 400 = 5x

5x = x + 400

4x = 400

x = 100

Lindbergh's speed was 100 mph

b. 5x = 5 * 100 = 500

Today's planes fly at 500 mph

answer: 12

step-by-step explanation:

1.3

step-by-step explanation:

3x2=6   9x+6

bring down the 6 on both sides

6+6=12

12= 9x

divide by 9

12/9 =

1.3 =x